Physics – Geophysics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jatp...38..103p&link_type=abstract
(International Union of Geodesy and Geophysics, General Assembly, 16th, Grenoble, France, Aug. 22-Sept. 6, 1975.) Journal of Atm
Physics
Geophysics
D Region, Lunar Tides, Upper Atmosphere, Atmospheric Models, Atmospheric Pressure, Density Distribution, Dynamo Theory, Meteor Trails, Time Response
Scientific paper
Data consisting of precisely reduced photographic trails of 318 meteors with mean altitudes between 85 and 110 km were analyzed in order to search for the presence of a lunar semidiurnal tidal term in upper atmospheric density variations. It was found that the time of maximum of the variation of the change of the weighted means of the departure of the observed density in the region 85-110 km from that tabulated in the Standard Atmosphere (1962) does not occur half an hour after lunar transit, as was found at ground level, or 6 and a half hours later (assuming a phase reversal), but at some intermediate time which Fourier analysis indicates to be about 3 hours after lunar transit. If this result is a general phenomenon, and not an isolated result for a single site, it would indicate that the dynamo region must be higher that 110 km.
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